Year Percent of GDP 2004-01-01 18.1163024211874 2005-01-01 18.0353087636423 2006-01-01 16.6344022798885 2007-01-01 12.9533740721768 2008-01-01 16.1612310572038 2009-01-01 17.4759811174512 2010-01-01 20.2207693047759 2011-01-01 21.5042254779133 2012-01-01 20.3330451804987 2013-01-01 15.6544824080765 2014-01-01 17.6448853494782 2015-01-01 20.7410730279176 2016-01-01 23.3482236579365 2017-01-01 24.1594245313003 2018-01-01 24.7302810563985 2019-01-01 24.7171329835726